Program that use non recursive function to find the factorial of a given integer

Description:

Factorial of a number is nothing but the multiplication of numbers from a given number to 1

Ex: 5! =5*4*3*2*1= 120

Algorithm: main program

Step 1: start

Step 2: read n

Step 3: call the sub program fact(n)

Step 4: print the f value

Step 5: stop

            Sub program:

Step 1: initialize the f=1

Step 2: if n==0 or n=1 return 1 to main program. If not goto step 3

Step 3: perform the looping operation as follows

                        For i=1 i<=n; i++

Step 4: f=f*i

Step 5: return f value to the main program

 

 Program:

#include<stdio.h>

#include<conio.h>

int fact(int n)   //starting of the sub program

 {

              int f=1,i;

              if((n==0)||(n==1))  // check the condition for n value

              return(1);

              else

            for(i=1;i<=n;i++)  // perform the looping operation for calculating the factorial

              f=f*i;

  return(f);

 }

void main()

{

  int n;

  clrscr();

             printf("enter the  number :");

  scanf("%d",&n);

  printf("factoria of number%d",fact(n));

  getch();

}

Output:

1.Enter the number: 7

  Factorial of number: 5040

2. Enter the number: 6

  Factorial of number: 720

3. Enter the number: 8

   Factorial of number: -25216

Conclusion:

The program is error free

VIVA QUESATIONS:

1)      What is meant by call by value ?

Ans:  passing values to the function as arguments

2) What is meant by call by reference ?

Ans: passing address to the function as  arguments

3)define actual parameters ?

Ans: The actual parameters  often known as arguments are specified  in the function call.